Zielnowo was formerly part of the German Empire. In the German Empire, the place was called Silnau.
The place is now called Zielnowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sellnowo | German Empire | Graudenz | before the Versailles Treaty |
| Zielnowo | Poland | Grudziądz | after the Versailles Treaty |
| Silnau | German Empire | Graudenz | 1939 |
| Zielnowo | Poland | Wąbrzeźno | 1945 |
| Zielnowo | Poland | Toruń | 1992 |